An improved CFD modeling approach applied for the simulation of gas–liquid interaction in the ozone contactor along with structure optimization

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

“…Such dissolved ozone concentrations are also typical of those found in chamber-in-series types of ozonation reactors where dissolved ozone concentrations range from 200 to 300 mg L −1 . 14,18 In comparison, when FA was present in the feed stream, the dissolved ozone concentration was reduced to 1.0 nM due to the rapid consumption of dissolved ozone by FA (Figure 2b). This low dissolved ozone concentration increased the ozone interphase transport rate, which led to more rapid ozone dissolution with the average ozone transport rate increasing from 0.0022 mg L −1 s −1 in the absence of FA to 0.037 mg L −1 s −1 in the presence of FA.…”

“…Various modeling approaches have been used to describe the hydraulic behavior − and, to some extent, the oxidation performance of ozonation reactors. − Computational fluid dynamics (CFD) tools appear to hold particular promise in assessing the likely efficacy of the ozonation process in view of their ability to describe the flow behavior in full-scale reactors. ,,− For example, Wols et al developed a CFD model to simulate the disinfection performance of an ozone contactor using an empirical equation relating the concentration-contact time (CT) value and the level of disinfection. Zhang et al incorporated first-order ozone self-decay and second-order ozone oxidation of natural organic matters in a CFD model of an ozone contactor.…”

“…Dodd et al developed a process model using film theory to estimate ozone interphase mass transfer . Chen et al also incorporated the ozone interphase mass transfer in the CFD model developed to evaluate ozone dissolution in an ozone contactor. ,, However, key parameters, such as gas holdup and superficial velocity, which are critical for estimating ozone interphase mass transfer, are often assumed to be constant rather than spatially varying, which can affect model accuracy for reactors with complex geometry and hydraulic conditions. Furthermore, even though the mass transfer of ozone has been simulated using various empirical correlations, the absence of comprehensive reaction kinetics modeling in the liquid phase also renders validation of the ozone interphase mass transfer difficult .…”

Effect of Microplastics on the Flow-Through Electro-Peroxone Process: A Computational Fluid Dynamics Simulation

“…Due to the lack of detailed kinetic data, incorporating these reactions into the CFD model would be speculative and could undermine the model’s robustness. , Experimentally determined concentrations of H 2 O 2 , HO·, and aqueous O 3 were 4.70 × 10 –4 , 1.15 × 10 –13 , and 4.20 × 10 –6 mol/L, respectively . This approach, validated in other CFD modeling studies, is reliable and applicable. ,, Research has shown that the concentration of HO· reaches a pseudosteady state when its decomposition rate equals its production rate. ,, This constant concentration simplifies the model while ensuring accurate and meaningful results in mass transfer.…”

“…19 This approach, validated in other CFD modeling studies, is reliable and applicable. 19,36,37 Research has shown that the concentration of HO• reaches a pseudosteady state when its decomposition rate equals its production rate. 18,22,38 This constant concentration simplifies the model while ensuring accurate and meaningful results in mass transfer.…”